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3 years ago

Ideas of the atom have changed over time.

Chemistry

2 answers:

vesna_86 [32]3 years ago

8 0

Answer:

An atom is solid material.

Explanation:

The state of matter of an atom is neither solid, liquid nor gases. Matter is an aggregate of atoms which exists in physical states of solid, liquid or gases.

This idea of an atom is inacurate and widely regarded as inconsistent.

The other options are correct assumptions of an atom.

Electrons are subatomic particles that carries negative charges on them.

Electrons orbits the nucleus which is the center of an atom in discrete layers called orbitals.

Dahasolnce [82]3 years ago

8 0

An atom is a solid material.

Explanation : Atomic theory depicts how atom has changed over time. The first atomic model theory was given by JJ Thomson in the year 1904. An atom as a solid material is now believed as imprecise by the scientists. It is believed that an atom has a nucleus that is located at its center surrounding to which are the orbits where electrons are present.

Electrons are negatively charged particle. The nucleus has protons (positively charged) and neutrons (negatively charged) in it.

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3 years ago

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Answer:

Explanation:

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3 years ago

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Explanation:

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3 years ago

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Margaret [11]

Answer:

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Explanation:

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3 years ago

In a certain industrial process involving a heterogeneous catalyst, the volume of the catalyst (in the shape of a sphere) is 10.

olga nikolaevna [1]

Answer:

a. The second run will be faster.

d. The second run has twice the surface area.

Explanation:

The rate of a reaction is proportional to the surface area of a catalyst. Given the volume (V) of a sphere, we can find its surface area (A) using the following expression.

$A=\pi ^{1/3} (6V)^{2/3}$

The area of the 10.0 cm³-sphere is:

$A=\pi ^{1/3} (6.10.0)^{2/3}=22.4cm^{2}$

The area of each 1.25 cm³-sphere is:

$A=\pi ^{1/3} (6. 1.25)^{2/3}=5.61cm^{2}$

The total area of the 8 1.25cm³-spheres is 8 × 5.61 cm² = 44.9 cm²

The ratio of 8 1.25cm³-sphere to 10.0 cm³-sphere is 44.9 cm²/22.4 cm² = 2.00

Since the surface area is doubled, the second run will be faster.

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3 years ago